Furnace



snwhnnze COLE, or cmcaeo, ILLINOIS, ASSIGNOR reconnmaemewame coar- PANY, OF o IeA-eaimmms, aeoaroaarzen or tremors.

memes.

"AppIic'tion 'liIed July 2, 1923. 'seria-1'e4as71.

Tqallwhom it may concern: 1 k for "circulating theairthro Be it known that I, En'wiiub P QoL'n, a iag chamber of "ajiotaii I citizen of the United States, residing crease theeifi' yjp f the urnace'; Chicago, in the county of Cook and State rangezthe circulating device. ext" nally 5 of Illinois, have in'v'enteld certain new and ofthe furn'ace'and'coldail-duct; to arrange 60 useful Improvements in: Furnaces, of which thedev-ice so'th'at it does-not interfere with the following is a specification. 7 o or iinpetle the naturalcirculation of air Myinvention relates to hot air furnaces, through the furnace when the circulating 'deand has reference more particularly to the vice is ineper tiveym preveat eominunica- 10 method and means for circulating air tionof noise from the gbleweathroagh the 65 through the air jacket of the furnace I heating'cennections lto the varia t parts of Air can be heated only by convection, and thc builtling; to adapt the, furnace to be radiant heat thereforehas no effect upon the used for cooling purposes in ummer, and air passing through a furnace,gexcept as it in general, to provide a siniple and depend? strikes the outer walland causes the latter able air fcircula-t'ing clevice' wliicl1 may be 70 to act as a Convector. It is important, thereattached to hot air furnaces of'the ordinary fore to keep the temperature of the air heatt'y-pe without requiring a special construction ing walls below. the point at which any conof the latter or extensive alterations there siderable amount of radiant heat is? deof to 'pern'i'it the installation of the device. v'eloped. or I the, drawings: r i The tei'nperature of the heating walls of Fig. 1 is [a top ,view of a 'f unmcewith an the furnace is governed largely by the volair circulatingdeviceappliedthereto in acuine of fair passingthrough the air heatcord'ance "with my invention; 7 j I in space, and in furnaces which depend Fig. 2a rear viewcof the sneucwie si wn upon gravity circulation, the voluineiof air in Fig.1, with partsof t-he furnace brok B0 is oftentimes insufficient, particularly at away to disclose detaiisiof the construction; times othea'v firing, to prevent heating of and l p i the walls to the point of excessive radia- Fig. San enlargedsec'tional viewon the tion. This results in overheatii'ig of' the line'3 3 of F iglfl, showing the inanner of I; outer casing and' consequent waste of inuch connecting the blowerj'with the furnace. heat in the-basement or furnace room, and Referring to the drawingspl have incliin addition the air passing through the cated seinewhat diagrammaticallyahotair pipes to the various parts of the building is furnace of the usual typehavingthe fir'e, box so highly heated that there is considerable 2, ash pit, 3 and sinokedruin 4 surrounded 33' loss of heat through the pipes,- Moreover, by an outer casings to a' ord an air space 9 v I unhealthful air conditions are caused in the 6, through which air is circulated so as to rooms and the furnace castings rapidly burn be heated. A large air duct/T118 (C mlected out. i i l to the casing 5 near the bot-toin for intro- With my invention, which may be readily duci-ng air into the air space andjgone or 1,1

vapplied to any furnace, a very large volume more outlets S are provided at the top of of airis circulated through the heatings'pace the air space through which the heated air so that the temperature of the heating walls is supplied. to the rooms which are to be is kept suficiently low to avoid excessive heated. This arrangement of the cold air radiation and waste of heat. This insures duct 7 at: the lower end of the casing 5 and 4 greater efficiency, avoids heating of the air the outlets 8 at the upper end thereof causes to an unhealthful condition, supplies an a gravity circulation of air throughthe air abundance of fresh air to, the rooms, and space 6 due to.the;heating ofthe air in said prolongs the life of the furnace castings. space; Such circulation, h0wever,'is at times 7 Moreover, the air is forced (directly against insufiicient to obtain the greatest ,efliciency Q the walls of the furnace which are most from the furnace and it is desirable to pr0 of the walls rapidly and thereby further ininthe' air space i 7 highly heated, so as to dissipate the heat vide means, to increase thecirculationof air creases the efficiency of the furnace. I This accomplished in iny inventionby The princ pal ob ects of my mvention are providing a blower 9, at jtl'ie exterror 03fv to provide an improved inethod andnreans the furnace and cold airduct "7, which is] I are arranged in the inlet pipe 12 as shown operated by a motor 10 and has the inlet connected by a pipe 11 to the air duct 7 at a distance from the discharge end of the latter, said pipe 11 being quite small in comparison with the size of the cold air duct 7. This blower 9 is preferably of the centrifugal type and has the outlet connected by a tapered or gradually expanded duct 12 with the casing 5 at a point just above or with its lower extremity substantially one line with the top of the opening into the air space." 1.6 from the air duct 7, as shown in Fig. 2, and said duct 12 ist-ilt'ed upwardly at a slight inclination so'as 'to discharge the air from the blower, with a slight upward impulse, against the fire pot of the furnace. Fins or division plates 13 by dotted lines in Fig.1, to direct the air and prevent eddies and back currents. This duct 12 enters the air space 6, close at the side of the inlet opening from the duct 7 so that the dire"tion of flow of the air from the pipes '7 and 12 is in the same generaldirection. This arrangement of the air inlet 12 above the air inlet 7 with a slight upward inclination and so as to discharge in the same general direction as the flow of air from the cold air duct 7, prevents the inrush of air from the blower opposing or retardingthe flow of air through the duct 7 into the air space 6 and increases the volume of air flowing through the duct 7 into the air space 6.

To avoid transmission of noise from the blower through the furnace and pipes to the various parts of the building, flexible connections are provided between theblower inlet and outlet and the pipes 11 and 12, each of these connections comprising a short piece .14- of canvas tubing which has the opposite ends secured by clamps 15 respectively to the pipe 12 and blower outlet or the pipe 11 and blower inlet.

It will be observed that the parts coinposing this. air circulating device areall arranged at the exterior of the furnaceand cold air duct and that the deviceis capable of being readily'attached to the ordinary typeof \hot air furnace without necessitatmg. 'a special construction of the latter or extensive changes to adapt same to have the circulating device applied thereto.

While I have shown and described my invention in a preferred form, I am aware thatvarious changes and modificationsmay be made without departing from the prin ciples of my invention, the scope of which is to be determined by the appended claims.

I claim as: my invention:

1. The combination with a furnace comprising inner and outer casings with an intermediate air heating space having an exhaust opening at the top and a cold air duct leading into the lower end thereof, of

an air circulating device arranged outside of andpermitting unobstructed circulation through the cold air duct and aforesaid air heating space, and comprising a smaller duct leading from the cold air duct and terminating at the outer casing of the furnace and'having a blower interposed between the ends thereof for withdrawing air from. the cold air duct and dis-charging same into the air heating space in an upward direction. 1

2. Thecombination with a furnace having'finner and outer casings with an intermediate air ieating space having an outlet at the top and a cold air duct leading into the lower end thereof at one side of the furnace, of an auxiliary duct of reduced size relative to the cold air duct having the outer end connected at any elevated point with the cold air'duct at a distance from the furnace, extending in an inclined position and having the inner end extending laterally towards and communicating with the aforesaid air heatingspace in convergent relation to and adjacent the cold air duct so as to discharge against the wall of the inner casing in substantially the same direction as the cold air duct, and a blower in said auxiliary air duct for enforcing circulation through the auxiliary air duct from the cold air duct to the air heating space. g p

3. The combination with a furnace'having'inner and outer "casings with an intermediate air heating space having an exhaust opening at the top and a cold alr duct having a horizontal position leading into the lower end thereof, of an air circulating device comprising .an auxiliary air duct arranged externally of the cold air duct and the air heating space and having the outer end connected to the cold air duct at an elevated position a distance from the furnace and the inner end terminating at and connected to the aforesaid outer casing so as to discharge laterally against the side of the inner easing of the furnace.

l. The combination with a furnace cornprising a heater casing enclosed in a shell so as to form an air space therebetween, of an air duct leading into the lower end of. said airspace, a by-pass connected to the air duct at a distance from and above its point of'connection with the shell and lead ing into said air space, anda blower 1n the bypass for enforcing circulation of air through the latter from the air duct into the air space immediately above the point 'of connection of the duct with the air space.

around the heater casing, said outer casing being provided with an outlet at the upper end and an inlet at the lower end, a vertical air duct having a lateral branch connected with said inlet, a by-pass smaller than the air duct connected with the air duct at an elevated position and leading into the outer casing so as to discharge against the fire pot, and a blower for enforcing circulation of air through the by-pass from the air duct to the air space within the outer casing.

6. In a furnace, the combination of a heater casing, an outer casing enclosing the heater casing so as to form an air space therearound, an air duct leading into the air space adjacent the lower end, a blower, a pipe leading from the air duct to the blower inlet, and a pipe leading from the blower outlet laterally into the aforesaid air space so as to discharge against the side of the heater casing and having spaced divergent walls from the outer end thereof to the inner end for distributing the air therefrom around the heater casing.

7. The combination of a furnace having a heater casing with an enclosing outer casing forming an air space therebetween, a cold air duct leading into the lower end of the air space, a blower having an outlet pipe communicating with the aforesaid air space so as to discharge against the side of the heater casing, and a plurality of laterally spaced separator on said outlet pipe for distributing the air around the heater casmg. i

8. The combination with a furnace and its cold air duct, of a blower outside the furnace and duct, a pipe connecting the cold air duct with the inlet of the blower and a pipe connecting the outlet of the blower with the furnace, both of said pipes comprising a section of flexible textile material interposed respectively between the blower and cold air duct and the blower and furnace so as to avoid communication of noise and vibra tion from the blower through the connections to the cold air duct and furnace. EDVVAR'D P. COLE. 

